Touch Input Device and Display Device Using the Same

1. A touch input device, comprising: a communication module receiving external light characteristic information; a code detector emitting infrared light and receiving infrared light reflected from a display panel that is not connected to the touch input device to detect code patterns of the display panel; a light emitting driver controlling an infrared light emission operation of the code detector; and a code processor modulating an emission control signal to change an infrared light emission characteristic of the code detector according to a change in the external light characteristic information and to control the light emitting driver, wherein the code processor modulates the emission control signal proportionally with respect to the change in the external light characteristic information so as to cause the light emitting driver to increase the amplitude of the infrared light when the external light characteristic information shows an increase in external light.

2. A touch input device, comprising: a communication module receiving external light characteristic information; a code detector emitting infrared light and receiving infrared light reflected from a display panel to detect code patterns of the display panel; a light emitting driver controlling an infrared light emission operation of the code detector; and a code processor modulating an emission control signal to change an infrared light emission characteristic of the code detector according to a change in the external light characteristic information and to control the light emitting driver, wherein the code processor detects an intensity of light, an amount of light, a color temperature, brightness, luminance, and/or a wavelength band from the external light characteristic information, and modulates an amplitude and a pulse width of the emission control signal so that an infrared light emission intensity or wavelength band characteristic of the code detector is changed according to a change in the intensity of light, the amount of light, the color temperature, the brightness, the luminance, and/or the wavelength band.

3. The touch input device of claim 2, wherein the code processor modulates the emission control signal so that the infrared light emission intensity or wavelength band of the code detector is changed in inverse proportion to a change in the intensity of light, the amount of light, the color temperature, the brightness, the luminance, and/or the wavelength band among the external light characteristic information, and supplies the modulated emission control signal to the light emitting driver.

4. The touch input device of claim 2, wherein the code processor modulates an amplitude and a pulse width of the emission control signal so that the infrared light emission intensity or wavelength band of the code detector is changed in proportion to a change the intensity of light, the amount of light, the color temperature, the brightness, the luminance, and/or the wavelength band among the external light characteristic information.

5. The touch input device of claim 2, wherein the code processor calculates radiation sensitivity according to a color temperature characteristic among the external light characteristic information using a look-up table and sets the radiation sensitivity as a conversion coefficient, sets an infrared light emission intensity or amount of light target value of the code detector by substituting the intensity or the amount of light among the external light characteristic information and the set conversion coefficient into Equation 1: Infrared light emission intensity (or amount of light)∝1/(intensity (or amount of light) of external visible light×conversion coefficient), and modulates the emission control signal according to the infrared light emission intensity or amount of light target value.

6. The touch input device of claim 2, wherein the communication module selectively supplies infrared light characteristic information to the code processor when the infrared light characteristic information is received from an external source.

7. The touch input device of claim 6, wherein the code processor modulates an amplitude and a pulse width of the emission control signal so that the infrared light emission intensity or wavelength band characteristic of the code detector is changed in proportion to a change in intensity or a wavelength band of infrared light among the infrared light characteristic information, and supplies the emission control signal of which the amplitude and the pulse width are modulated to the light emitting driver.

8. The touch input device of claim 6, wherein the code processor modulates an amplitude and a pulse width of the emission control signal so that the infrared light emission intensity or wavelength band characteristic of the code detector is changed in inverse proportion to a change in intensity or a wavelength band of infrared light among the infrared light characteristic information, and supplies the emission control signal of which the amplitude and the pulse width are modulated to the light emitting driver.

9. A display device, comprising: a display panel in which code patterns are formed; an illuminance sensor detecting external light characteristic information of the display panel; a main processor controlling image display driving of the display panel; and a touch input device receiving infrared light reflected from the display panel to detect shape data for the code patterns, generating coordinate data according to the shape data, and transferring the generated coordinate data to the main processor.

10. The display device of claim 9, wherein the main processor modulates digital video data so that luminance or brightness of an image displayed on the display panel is changed in proportion to a change in a detection value of an intensity of light, an amount of light, a color temperature, luminance, and/or brightness among the external light characteristic information input from the illuminance sensor.

11. The display device of claim 9, wherein the code patterns are formed in shapes of at least one electrode of a plurality of driving electrodes, a plurality of sensing electrodes, and a plurality of dummy electrodes included in a touch sensor of the display panel, or the code patterns are formed by light blockers on partial areas of front surfaces of at least one electrode of the plurality of driving electrodes, the plurality of sensing electrodes, and the plurality of dummy electrodes.

12. The display device of claim 11, further comprising a proximity sensor emitting infrared light toward a front surface or at least one side surface of the display panel and detecting infrared light characteristic information on infrared light reflected from the front surface or the at least one side surface of the display panel.

13. The display device of claim 12, wherein the touch input device includes: a communication module receiving the external light characteristic information; a code detector emitting infrared light and receiving the infrared light reflected from the display panel to detect the code patterns; a light emitting driver controlling an infrared light emission operation of the code detector; and a code processor modulating an emission control signal so that an infrared light emission characteristic of the code detector is changed according to a change in the external light characteristic information and controlling driving of the light emitting driver.

14. The display device of claim 13, wherein the code processor detects an intensity of light, an amount of light, a color temperature, brightness, luminance, and/or a wavelength band from the external light characteristic information, and modulates an amplitude and a pulse width of the emission control signal so that an infrared light emission intensity or wavelength band characteristic of the code detector is changed according to a change in the intensity of light, the amount of light, the color temperature, the brightness, the luminance, and/or the wavelength band.

15. The display device of claim 14, wherein the code processor modulates the emission control signal so that the infrared light emission intensity or wavelength band of the code detector is changed in inverse proportion to a change in the intensity of light, the amount of light, the color temperature, the brightness, the luminance, and/or the wavelength band among the external light characteristic information, and supplies the modulated emission control signal to the light emitting driver.

16. The display device of claim 13, wherein the code processor modulates an amplitude and a pulse width of the emission control signal so that the infrared light emission intensity or wavelength band of the code detector is changed in proportion to a change in the intensity of light, the amount of light, the color temperature, the brightness, the luminance, and/or the wavelength band among the external light characteristic information.

17. The display device of claim 16, wherein the code processor calculates radiation sensitivity according to a color temperature characteristic among the external light characteristic information using a look-up table and sets the radiation sensitivity as a conversion coefficient, sets an infrared light emission intensity or amount of light target value of the code detector by substituting the intensity or the amount of light among the external light characteristic information and the set conversion coefficient into Equation 1: Infrared light emission intensity (or amount of light) of light emitter∝1/(intensity (or amount of light) of external visible light×conversion coefficient), and modulates the emission control signal according to the infrared light emission intensity or amount of light target value.

18. The display device of claim 13, wherein the communication module selectively supplies infrared light characteristic information to the code processor when the infrared light characteristic information is received.

19. The display device of claim 18, wherein the code processor modulates an amplitude and a pulse width of the emission control signal so that the infrared light emission intensity or wavelength band characteristic of the code detector is changed in proportion to a change in intensity or a wavelength band of infrared light among the infrared light characteristic information, and supplies the emission control signal of which the amplitude and the pulse width are modulated to the light emitting driver.

20. The display device of claim 18, wherein the code processor modulates an amplitude and a pulse width of the emission control signal so that the infrared light emission intensity or wavelength band characteristic of the code detector is changed in inverse proportion to a change in intensity or a wavelength band of infrared light among the infrared light characteristic information, and supplies the emission control signal of which the amplitude and the pulse width are modulated to the light emitting driver.

21. An electronic device including a display device, wherein the display device comprising: a display panel in which code patterns are formed; an illuminance sensor detecting external light characteristic information of the display panel; a main processor controlling image display driving of the display panel; and a touch input device receiving infrared light reflected from the display panel to detect shape data for the code patterns, generating coordinate data according to the shape data, and transferring the generated coordinate data to the main processor.